Mechanism for transforming the reciprocal movement of a piston into a circular movement of a shaft

Abstract

Device for transforming the alternating motion of a piston into a circular motion of a shaft with the possibility of predetermining the stop time of the piston at each of the two dead centers. It is comprised of an assembly of two pistons connected by two racks alternatingly in mesh with a toothed sector keyed on the shaft. On either side of said sector there is provided a cam of which the groove takes charge of the pistons, through rollers at the two dead centers.

What is claimed is: 
     
       1. A device for transforming a reciprocal movement of a piston into a continuous rotary movement of a shaft, which comprises: (a) a pair of pistons, each said piston providing a stroke in an opposite direction;   (b) two racks, each rack integral with and travelling uniformly in response to a stroke from both of pistons;   (c) said shaft;   (d) a circular grear having a toothed sector fixed to said shaft and disposed between said two racks, said toothed sector being in meshing engagement with one of said racks during a stroke from one of said pistons in one direction and in meshing engagement with the other of said racks during a piston stroke from the other of said pistons in the opposite direction;   (e) two rollers disposed and fixed on opposite faces of each of said pistons, on the longitudinal axis thereof; and   (f) two cams fixed on said shaft, each cam having a groove having five different zones co-acting with one of said rollers one said zone being concentric with the rotational axis of said shaft and corresponding to the termination of the stroke of one of said pistons, said cams guiding said rollers.   
     
     
       2. Device according to claim 1, wherein the second and last but one teeth of said racks are partially truncated. 
     
     
       3. Device according to claim 1, wherein the end teeth of the toothed sector are partially truncated. 
     
     
       4. Device according to claim 2, wherein the end teeth of the toothed sector are partially truncated.